.header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  width: 100%;
  height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #fff;
  font-size: 13px;
}

.header a {
  margin: 0 10px;
}
